Regulator.



A. M; SMITH.

REGULATOR.

APPLICATION FILED 1ULY23, 1915.

Patented July 24-, 1917.

llNl TA AENT Fl@E..

ALLEN M. SMITH, 013 FORT SN'ELLING, MINNESOTA.

REGULATOR.

I '0 all whom it may concern:

Be it known that I, ALLEN M. SMITH, a citizen of the United States, residing at Fort Snelling, in the county of Hennepin, State of Minnesota, have'invented certain new and useful Improvements in Regulators; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to improvements in regulators, and Particularly to devices for opening and closing the draft doors of stoves or furnaces.

One object of the invention is to provide an automatic device which will open the draft door of a stove or furnace when the temperature in a room reaches a temperature below a predetermined or normal degree.

Another object is to provide an automatic draft door operating device which will close the said door when the temperature gets above the normal degree.

A further object is to provide an automatic device of this character whereby the door of the furnace or stove will remain in open or closed position when operated, until the temperature changes.

Other objects and advantages will be apparent from the following description when taken in connection with the accompanying drawing.

In the drawing:

Figure 1 is an elevation of my draft door closing mechanism, in connection with the draft door of a furnace,

Fig. 2 is an enlarged vertical longitudi nal sectional view through the electro-magnetic portion of the device,

Fig. 3 is an end view, partly broken away, showing the means for holding the dev1ce in operative position after it has been actuated, and

Fig. 4 is an enlarged elevation of the circuit closing means.

Referring particularly to the accompanying drawing, 10 and 11 represent a pair of depending brackets mounted on the ceiling of the cellar or room in which the furnace 12 is located. Depending between these brackets and also secured to the ceiling is a Specification of Letters Patent.

Application filed July 23, 1915.

Patented July 21, 1917.

Serial No. 41,561.

bracket 13, on which is centrally pivoted a rock arm 14, the ends of which extend through vertical slots 15 formed in the brackets 10 and 11. Carried by each of the brackets 10 and 11 are the solenoids 16, the cores 17 of which are connected to the ends of the rock arm 14 by means of the links 18. Carried by the end of the arm 14L outwardly of the bracket 11, is a depending weight 19, while a smaller weight 20 depends from the outer end of the other portion of the arm outwardly of the bracket 10. Mounted on each of the brackets is a permanent horseshoe magnet 21 which is arranged to attract and hold a depending metal member 22 carried by the end of the arm 14, so as to hold said arm in lowered position when moved downwardly by the solenoids. Mounted at any suitable point in a room of the house is a depending bar formed preferably of the two connected strips of brass 23 and the rubher or gutta-percha 24. Carried by the lower end of this bar is a transversely extending metal pin 25, the ends of which are adapted to successively engage the points of the screw contact members 26 and 27 carried by the depending supporting members 28 disposed on either side of the thermostatic bar. Connected to the pin 25 and to the battery cells 29 is a wire 30. Leading from the contact member 27 to the coils of the solenoids of the bracket 10 is a wire 31, while leading from the other contact member 26 to a contact member 32 carried by the bracket 11 is a wire 33. Pivotally mounted on the bracket 11 is an arm 34:, one end of which is disposed in line to be engaged and depressed by the adjacent end of the rock arm 1+l, while its other end is arranged to engage with the before-mentioned contact member 32. Connected to this lever 34 and leading to the coils of the solenoid of the bracket 11, is a wire 35. Mounted on the bracket 10 is a similar contact member 36 arranged to he engaged by a pivoted lever 37 similar to the lever 34 and having one end arranged to be engaged and depressed by the adjacent end of the arm 14. From this arm 37, a wire 38 leads to the other end of the coils of the solenoid in the bracket 11. A wire 39 leads from the contact member 36 to the other side of the coils of the solenoid and the bracket 10. A wire 40 leads from the battery 29 and connects with this wire Connecting the draft door 41 of the furnace with the end of the rock arm 1+l which projects through the bracket 10, is a chain 42.

In the operation of the device, when the draft door 11 is opened, and the temperature in the room reaches a degree above normal, the thermostatic bar which consists of the brass and gutta-percha strips 23 and 24, Wlll contract and engage the pin 25 with the contact member 27 Current will then flow over the wires 30 and 31, through the battery and energize the solenoid in the bracket 10. The arm 37 being in contact with the member 36, the circuit will here be completed. The solenoid will draw down the connected end of the rock arm 14, thus slackening the chain 42 and permitting the door 41 to swing into closed position. This clownward movement of the end of the rock arm brings the metal member 22 into engagement with the horseshoe magnet 21 where it will remain. This downward movement of the rock arm end rocks the arm 37 out of engagement with the contact member 36, thus breaking the circuit. The arm 34 falls by gravity into contact with the member 32, thus preparing for the completion of the circuit therethrough when the temperature falls below normal.

When the temperature falls below normal the thermostatic bar will swing over into engagement with the contact member 26. Current will then flow through the contacts 25 and 26, through the wires 30 and 33, the battery 29, the arm 3%, the contact 36 and the solenoid of the bracket 11. This solenoid will then be energized to draw down the adjacent end of the arm 14. The pull of this solenoid will be strong enough to detach the member 22 from the magnet 21 and permit that end of the arm to rise. The end of the arm 14, which is pulled down in the bracket 11 rocks the arm 34 out of contact with the member 36, thus breaking the circuit, while the other end of the arm pulls the draft door #11 open by means of the chain 42.

Thus there is provided an efficient device whereby the draft of the furnace is accurately and automatically regulated by the temperature of the room. By turning inwardly or outwardly the screw contacts 26 and 27, the swing of the thermostatic bar can be lengthened or shortened so that the draft door will only be operated by greater or lesser rises or falls in the temperature.

What is claimed is:

1. In an automatic draft regulator for a furnace, the combination of a thermostat, a source of current connected there'tofa pair of brackets, a rocking element connected at one end to the draft door of the furnace and having its ends movable in said brackets, an elcctro-lnagnetic device supported in each bracket and connected to said source of current and to said rocking element, a circuit breaker pivoted to each bracket and operated by the movement of said rocking element to break the circuit through the electro-magnetic device carried by the bracket to which said circuit breaker is pivoted and a magnet carried by each bracket and adapted to releasably hold said rocking element in an actuated position.

2. In an automatic draft regulator for a furnace, the combination of a thermostat, a source of current connected thereto, a pair of slotted brackets, a rocking element pivotally mounted between said brackets and connected at one end to the draft door of the furnace and having its ends movable in the slots in said brackets, an electro-magnetic device supported in each bracket and connected to said source of current and to said rocking element, and a circuit breaker pivoted to each bracket and having a portion thereof extending across the slot in said bracket whereby said portion is contacted by said rocking element to break the circuit through the electro-magnetic device carried by the bracket to which said circuit breaker is pivoted.

3. In an automatic draft regulator for a furnace, the combination of a thermostat, a source of current connected thereto, a pair of slotted brackets, a rocking element pivotally mounted between said brackets and connected at one end to the draft door of the furnace and having its ends movable in f the slots in said brackets, an electro-magnetic device supported in each bracket and connected to said source of current and to said rocking element, a circuit breaker pivoted to each bracket and having a portion thereof extending across the slot in said bracket whereby said portion is contacted by said rocking element to break the circuit through the electro-magnetic device carried by thebracket to which said circuit breaker is pivoted and a magnet carried by each bracket and adapted to releasably hold said rocking element in a connected position.

1. In an automatic draft regulator for a furnace, thecombination of a thermostat, a source of current connected thereto, a pair of slotted brackets, a rocking, element pivotally mounted between said brackets and connected at one end to the draft door of the furnace and having its ends movable in the slots in said brackets, an electro-magnetic device supported in each bracket and connected to said source of current and to said rocking element, a circuit breaker pivoted to each bracket and having a portion thereof extending across the slot in said bracket whereby said portion is contacted by said rocking element to break the circuit In testimony whereof, I affiX my signature, through the electro-magnetio devlce carried in the presence of tWo Witnesses. by the bracket to whlch said clrcult breaker is pivoted, a magnet carried by each bracket ALLEN SMITH and adapted to releasably hold said rocking Witnesses:

element in a connected position and a Weight CHESTER WILLIAMSON,

carried by each end of said rocking element. DOROTHY WILLIAMSON.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

